478639 has 8 divisors (see below), whose sum is σ = 553248. Its totient is φ = 405600.

The previous prime is 478637. The next prime is 478651. The reversal of 478639 is 936874.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478639 - 2¹ = 478637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 478598 and 478607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 1045.

It is an arithmetic number, because the mean of its divisors is an integer number (69156).

478639 is a Friedman number, since it can be written as 78^3-9+4^6, using all its digits and the basic arithmetic operations.

2⁴⁷⁸⁶³⁹ is an apocalyptic number.

478639 is a deficient number, since it is larger than the sum of its proper divisors (74609).

478639 is a wasteful number, since it uses less digits than its factorization.

478639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785.

The product of its digits is 36288, while the sum is 37.

The square root of 478639 is about 691.8374086445. The cubic root of 478639 is about 78.2232808979.

The spelling of 478639 in words is "four hundred seventy-eight thousand, six hundred thirty-nine".